Effect of redispersible emulsion powder in mortar

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In the mortar is to make the traditional cement mortar brittleness, high elastic modulus and other weaknesses are improved, given the cement mortar better flexibility and tensile bond strength, to resist and delay the generation of cement mortar cracks, due to the polymer and mortar to form an interpenetrating network structure, the formation of a continuous polymer film in the pores, strengthen the bond between the aggregate, blocking part of the pores in the mortar, therefore, the performance of the hardened modified mortar is greatly improved than that of the cement mortar. Greatly improve the simple cement products are easy to crack and water resistance, impact resistance, acid resistance, poor shortcomings, to a certain extent, affected the practical effect of cement

The role of redispersible latex powder in mortar is mainly in the following aspects:

1 improve the compressive strength and flexural strength of mortar.
2 The addition of latex powder improves the elongation of the mortar, thus improving the impact toughness of the mortar, and also gives the mortar a good stress dispersion effect.
3 improve the bonding performance of mortar. The bonding mechanism is to rely on the adsorption and diffusion of macromolecules on the sticky surface, and the rubber powder has a certain permeability, and the cellulose ether fully infiltrates the surface of the base material together, so that the surface properties of the base and the new plaster are close to each other, thus improving the adsorption and greatly increasing its performance.
4 reduce the elastic modulus of mortar, improve the deformation capacity, reduce the cracking phenomenon.
5 to improve the wear resistance of mortar. The improvement of wear resistance is mainly due to the existence of a certain amount of glue on the surface of the mortar, the glue powder plays a bonding role, and the mesh membrane structure formed by the glue powder can pass through the holes and cracks in the cement mortar. The bonding between the base material and the cement hydration products is improved, thereby increasing the wear resistance.
6 gives the mortar excellent alkali resistance.
7 to improve cohesion, excellent resistance, enhance the flexural strength.
8 to enhance water resistance, permeability.
9 Improve water retention, increase opening time, and improve workability.
10 to enhance durability.

Key words:

Redispersible latex powder